Change-speed gearing for engine-lathes.



No. 787,537. PATENTED APR. 18, 1905.

A. E. NEWTON. CHANGE SPEED GEARING FOR ENGINE LATHES.

AP PLmATIoN FILED JULY 7,1903.

' 4 SHEETS-SHEET 1.

lllllilllllllllllllllllllllllllll M565; D fzdsniwu:

Q- 787,537- PATENTED APR. 18; 1905.

A. E. NEWTON. CHANGE SPEED GBARING FOR, ENGINBLATHES.

APPLICATION FILED JULY 7,1903.

' 4 SHEETS-SHEET 2.

. PATENTEE APR. 18, 1905.

l A. E. NEWTON. CHANGE SPEED GEARING OE ENGINE LATHES.

APPLICATION FILED JULY, 7,1903.

I 4 SHEETS-SHEET 3.

17 den 8 J1 FB eur/vm J 9 5 My Irma-7,537. PATENTED APR.18,1905.

A. E. NEWTON.

CHANGE SPEED GEARING FOR ENGINE LATHES.

I APPLICATION FILED JULY 7, 1903.

4 SHEETS-BHSET 4.

UNITED STATES E'atented April 18, 1905. l

A PATENT OFFICE.

ALBERT E. NEWTON, OF WORCESTER, MASSACHUSETTS, ASSIGNOR TO THE PRENTICE BROTHERS COMPANY, OF WORCESTER, MASSACHU- SETTS, A CORPORATION OF MASSACHUSETTS.

CHANGE-SPEED GEARING FOR ENGINE-LATHES.

SPECIFICATION forming part of Letters Patent No. 787,537, dated April 18, 1905.

Application filed July 7, 1903. Serial No. 164,571.

To all whom, it may concern.-

Be it known that I, ALBERT E.NF.w'roN,a citi-- zen of the United States,residing atWorcester, in the county of Worcester and State of Massachusetts, have invented a new and useful Change-Speed Gearing for Engine-Lathes, of which the following is a specification.

The object of this invention is to provide an improved change speed gearing for enginelathes which can be economically manufactured and put in place and which can be conveniently manipulated to actuate either. the lead-screw or feed-rod which extendto the carriage.

Referring to the accompanying four sheets of drawings, forming part of this application for patent, Figure 1 is a front elevation of an engine-lathe with my improvements applied thereto. Fig. 2 is a cross-sectional view, on an enlarged scale, through the change-speed gearing. Fig. 3 is a front elevation thereof, partly in section. Fig. 4 is a partial end view of the bed, illustrating the construction of the sweep. Fig. 5 is a sectional view of the gearing used at the end of the bed, taken on planes 5 5 of Fig. 4:. Fig. 6 is an end elevation, and Fig. 7 is a front elevation, illustrating the construction of the bracket in which the changespeed gearing is arranged.

Referring in detail to the drawings, A designates the bed, B the head-stock, C the tailstock, and E the traveling carriage, of an engine-lathe. The carriage may be actuated by means of the usual feed-rod 10 for the usual feed or may be actuated by means of the leadscrew 11 for cutting screws. J ournaled in the rear part of the head-stock is a shaft 12, which is driven from the spindle in the headstock by means of the usual tumbler-gears 13, so arranged that said shaft can be turned in either direction. These tumbler-gears consist of two intermeshed intermediate gears arranged on a lever mounted on said shaft 12, one of which intermediates engages a pinion rigidly secured to said shaft 12. By rocking said lever power can be taken through one or both of said intermediates, whereby the change mentioned is obtained. This is a very common construction in lathes and is not detailed in this case, as'it forms no part of the present invention. are three gears 14:, 15, and 16. A bracket 17, which has two sets of journals 18 18 and 19 19, is secured on suitable projections on the front of the bed. These projections are cast on the bed, and when the same is planed the projections are finished or planed off smooth, so as to line properly with the bed.

Projecting outwardly from the left-hand lower journal 19 is a hub 190, which is finished or turned in line with the journals 19 19. A slotted shaft 20 is journaled in said bearings 19 19. On the end of said shaft are secured three gears 21,22, and 23. A sweep 2 1 is hung on said hub 190 inside of said gears. Said sweep has a longitudinal slot, fitted in which is a stud 25. Fitting on said stud is a bushing 26. A nut 27 is threaded on the stud 25. By manipulating this nut the bushing 26 can be set longitudinally on the sweep and tightly clamped in adjusted position. Fitted on said bushing 26 is a second bushing 28, and turning thereon is an intermediate gear 29, which is held in place thereon by a collar 30. The sweep has a transverse slot 31 at its upper end, fitted into which is a bolt 32, which is threaded in the end of the bed. By this constriiction the sweep can be turned on the hub 190 and tightly secured in adjusted position. By this arrangement the intermediate gear 29 can be adjusted so as to carry power between gears 14 and 21, between gears 15 and 22, or between gears 16 and 23, as desired. To accomplish this adjustment, it is only necessary to loosen the nut 27 and the bolt 32, adjust the intermediate gear 29 into the proper plane, then set the same to mesh with the desired gear on the shaft 20, tighten the nut 27, and swing up the sweep so that the intermediate gear 29 will mesh with the corresponding gear on the shaft 12. This forms a very convenient mechanism by which three different speeds may be obtained and does away with the usual set of interchangeable gears sometimes employed'for the purpose at Rigidly mounted on said shaft 12 the end of the bed. It is also advantageous in that the various adjustments can be quickly made, the gears being always in place, requiring no changing around or looking up. As will be noted also, the intermediate gear need be no greater in width than the six gears with which it meshes.

A counter-shaft 33 is fitted in the upper journals 18 18 of the bracket 17, and arranged on the same is a series of gear-wheels 34. Fitted on the shaft 20 is a forked lever 35, between the arms of which is arranged a pinion 36, which has a key secured therein and engaging the keyway cut in said shaft 20. An intermediategear 37 is journaled on the stud extending between the parts of said forked lever 35 to mesh with said pinion 36. The end of said lever is extended up in the form of a hook and is provided at its outer end with a handle 38. A pin 39 is fitted in the ear extending from said lever and is controlled by a spring-pressed foot 40, carried by said handle 38.

A cover-plate 41 is secured to the bed. This cover-plate has its end. encircling and nearly fitting the ends of the bracket 17 as shown in Fig. 6, so as to make a neat boxlike structure. The front lower edge of said cover-plate 41 is formed as shown in Fig. 3, and a guiding-rib 42 is formed thereon, on which said pin 39 rests and is supported. A series of holes 43 is bored in said cover-plate in line with the series of gear-wheels 34. By this construction the forked lever 35 and the pinion 36 can be slid longitudinally on the shaft 20, and when opposite the proper gear the handle 38 can be lifted and locked in place by means of the pin 39, so that the intermediate gear 37 will engage the proper gear of the series 34. By this construction power can be transmitted from the shaft 20 to any one of said gears of the series 34.

' The end of the counter-shaft 33 projects out through the right-hand journal 18 and has a keyway cut therein. Fitted on this projecting end is a slip-pinion 44, which has a key engaging said keyway. A gear 45 is arranged on the end of the lead-screw 11. A gear 46 has a projecting hub fitted in the hearing, which supports the lefthand end of the feed-rod 10. This gear is provided with clutch-teeth 47. A clutch 48 is arranged in the end of the feed-rod 10. A spring 49 normally keeps the clutch 48 in engagement with the clutch-teeth 47. A collar 50 is adjustably secured on the feed-rod. By setting this collar at the desired point when using the feed-rod the feed of the carriage can be automatically stopped when the carriage reaches a predetermined point in its travel. The slip-pinion 44 on the end of the counter-shaft 33 can be adjusted to engage either the gear 45 on the lead-screw or the gear 46, that actuates the feed-rod.

By putting the step-gearing on the countershaft 33 an important advantage is obtained in that the same change-speed gearing can be used toactuate either the ordinary feeds obtained by the feed-rod or the screw-feeds obtained by thelead-screw. It will be seen that when the slip-pinion 44 engages the gear 45 on the lead-screw 11 it is out of mesh with the gear 46 on the feed-rod 10 and that when the said slip-pinion 44 engages said gear 46 it is out of mesh with said gear 45. By means of this construction when the leadscrew is used to actuate the carriage that the feed-rod is notturning, and more particularly when the feed-rod is used to actuate the carriage that the lead screw is not turning.

Hence only the member which is to be used can be in operation. This adds to the eificiency of the device, as wear on the parts is saved and there'can be no confusion of feeds.

A further and important advantage is obtained by using this counter-shaft 33 and by arranging the same and the shaft 20 in the journals of the bracket 17, in that all this construction and gearing can be assembled and put together upon the bench. The lead-screw and. feed-rod can 'be applied to the lathe by bolting the brackets which support the same lathe to the bed. Then the bracket 17 can be secured in place on the bed, it merely being necessary to bring the same to position so that the gears 14 and 15 and 16 will come in the same planes with the gears 21 and 22 and so that the counter-shaft 33 will be in line so that the slip-pinion 44 can engage either gears 45 or 46. After the bracket 17 is secured in place the cover-plate 41 can be put in position. By this arrangement a very convenient device is provided which can be economically manufactured and assembled.

The details and arrangements herein described may be greatly varied by a skilled mechanic without departing from the scope thereof as expressed in the claims.

Having thus fully described my invention, what I claim, and desire to secure by Letters Patent, is

1. In an apparatus of the class described, the combination of a support, a driven shaft projecting therefrom, three gears varying in size mounted on said shaft, another shaft journaled also in said support parallel to said driven shaft from which power is to be taken, another set of three gears varying in size mounted thereon, a sweep carrying a stud and an intermediate gear carried by said stud, said intermediate gear having a width not greater than the gears with which it meshes and means whereby the intermediate gear can be set on said stud in three different positions axially.

2. In an apparatus of the class described, the combination of a grooved shaft and means for driving it, a pinion keyed to slide on said shaft, a lever journaled on said shaft, an intermediate gear carried by said lever and meshed with said pinion, a counter-shaft, a series of gears arranged thereon into any one of which said intermediate can be meshed, two additional parallel shafts and means for driving them alternately from said countershaft, said means consisting of a slip-pinion slidingly mounted on said counter-shaft, and a gear on each of said parallel shafts, these two gears being out of alinement with each other and having their teeth in alinernent with the teeth of the slip-pinion, whereby only one of the parallel shafts can be operated at the same time from said slip-pinion.

3. In an apparatus of the class described, the combination of a bed, a bracket attached thereto and having two sets of journals, a grooved shaft journaled in one set, a pinion keyed to and longitudinally adjustable on said grooved shaft, a lever hung on said grooved shaft, and an intermediate gear carried by said lever and meshed with said pinion, a counter-shaft journaled in the other set of bearings, a series of gears mounted on said counter-shaft into any one of which said intermediate can be meshed, and projections on the bed to which said bracket is secured.

L. In an apparatus of the class described, the combination of a bed or support, a bracket having two sets of journals, a grooved shaft journaled in one set, a pinion keyed to and longitudinally adjustable on said grooved shaft, a lever hung on said grooved shaft, an intermediate gear carried by said lever and meshed with said pinion, a counter-shaft journaled in the other set of bearings, a series of gears mounted on said counter-shaft into any one of which said intermediate can be meshed, projections on the bed or support to which said bracket is secured, and an independent cover-plate also secured to said bed or support which cover-plate said lever engages.

5. In an apparatus of the class described, the combination of a bed or support, a bracket having two sets of journals, a grooved shaft journaled in one set, a slidable pinion carried thereby, a hook-shaped lever hung on said grooved shaft, an intermediate gear carried thereby, said gear being meshed With said pinion carried thereby, a counter-shaft journaled in the other set of bearings, a series of gears carried thereby into any one of which said intermediate can be meshed, and a coverplate independently secured to the bed and having a guiding-rib which said hook-lever engages.

6. In an apparatus of the class described, the combination of a bed or support, a bracket attached thereto and having two sets of journals a grooved shaft journaled in one set of journals and a slidable pinion carried thereby, a lever hung on said shaft for sliding said pinion, an intermediate gearing carried by said lever, a series of gears mounted on the end of said shaft, a sweep hung concentric with said shaft, an intermediate mounted on said sweep and means for adjusting and holding it in different planes, a series of driven gears for actuating said intermediate, 'a counter-shaft journaled in the other set of bearings of the bracket, a series of gears arranged on said counter-shaft into any one of which said pinion can be meshed, a slip-pinion carried by said counter-shaft, and an additional pair of parallel shafts, a gear on each of said parallel shafts, these gears being adjacent to the slip-pinion whereby the slip-pinion may be meshed with either one or in both, for the purposes set forth.-

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

ALBERT E. NEWTON. Witnesses:

LoUIs W. SOUTHGATE, MARY E..REGAN. 

